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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb6f7758ebb39b093bacf83f4f5480adf07fcc0f85f8bcfd1664c052dc0d7f7' 
  AND token = 'ZRlplcpwZt5taSxB35kC6l4SGi/XW1t44J2cce9tFMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}